LOOKING FOR BLUEPRINTS-FBP

I AM LOOKING FOR TUBING, BLUEPRINTS OR ANY TEMPLATES FOR A PORTUGESE F B P SUB-GUN. INFORMATION ON THIS SUB-GUN IS VERY HARD TO LOCATE. THE FBP WAS MANUFACTURED AFTER WW2 AND LITTLE IS WRITEN ON IT. ANY INFO WILL BE HELPFULL.

My copy of "Small Arms of the World" has some info on the Model 48 F.P.B. The trigger is a direct copy of the one used in the M3 SMG. "It has a massive bolt and a telescoping operating spring assembly as originated by Erma and made famous by the MP38 and MP40." There is also a section view of the internals in the book.

This weapon is a combination of features of the German MP40 and the American M3 "Grease Gun", and was designed by Major Cardoso of the Portugese Army. Extensive use was made of steel pressings, and the result was a reliable and inexpensive weapon. 9 mm Parabellum, 32 shot detachable box magazine, 500 rpm, weight 7.65 lbs